21549472195 has 16 divisors (see below), whose sum is σ = 26479742400. Its totient is φ = 16829265024.

The previous prime is 21549472181. The next prime is 21549472201. The reversal of 21549472195 is 59127494512.

It is a cyclic number.

It is not a de Polignac number, because 21549472195 - 2¹⁷ = 21549341123 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151584 + ... + 257053.

It is an arithmetic number, because the mean of its divisors is an integer number (1654983900).

Almost surely, 2^21549472195 is an apocalyptic number.

21549472195 is a deficient number, since it is larger than the sum of its proper divisors (4930270205).

21549472195 is a wasteful number, since it uses less digits than its factorization.

21549472195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408894.

The product of its digits is 907200, while the sum is 49.

The spelling of 21549472195 in words is "twenty-one billion, five hundred forty-nine million, four hundred seventy-two thousand, one hundred ninety-five".